“Studies on T Cells in Newborns. Higher Reactivity of Umbilical Cord Blood Lymphocytes to PHA As Measured by Whole Blood Microtechnique”. Revista Española De Fisiología, vol. 33, no. 3, Sept. 1977, pp. 181-6, https://revistas.unav.edu/index.php/ref/article/view/49579.